Best way for registration which prevents anti automation

On my webservice, I have a registration form where the user can register with email address, username and password. For anti-automation, I send a confirmation-link to the email address.

This is how most of the webservices do it. But I´m thinking to go away from that email mechanism and simply use a captcha instead to prevent automated registrations.

What are the pros / cons of these two approaches regarding security and usability? And are there other mechanisms for that?

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电子邮件确认可以轻松实现自动化，更重要的是确保它是用户可以访问的真实地址（尽管不能保证）。

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